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refactor GetProvider 

Get provider needs to be provided with the plugin protocol version,
because it can't be imported here directly.

The plugin url types and methods were confusing; replace them with a few
functions to format the urls.
This commit is contained in:
James Bardin 2017-06-01 14:32:33 -04:00 committed by Martin Atkins
parent 8ad67991a5
commit 5f053a2e64
1 changed files with 38 additions and 56 deletions
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94
plugin/discovery/get.go
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@ -16,57 +16,49 @@ import (
getter "github.com/hashicorp/go-getter"
)
const releasesURL = "https://releases.hashicorp.com/"
var httpClient = cleanhttp.DefaultClient()
// pluginURL generates URLs to lookup the versions of a plugin, or the file path.
// Releases are located by parsing the html listing from releases.hashicorp.com.
//
// The URL for releases follows the pattern:
// https://releases.hashicorp.com/terraform-providers/terraform-provider-name/ +
// terraform-provider-name_<x.y.z>/terraform-provider-name_<x.y.z>_<os>_<arch>.<ext>
type pluginURL struct {
// the base url to search for releases
releases string
// The name prefix common to all plugins of this type.
// This is either `terraform-provider` or `terraform-provisioner`.
baseName string
//
// The plugin protocol version will be saved with the release and returned in
// the header X-TERRAFORM_PROTOCOL_VERSION.
const providersPath = "/terraform-providers/"
const protocolVersionHeader = "X-TERRAFORM_PROTOCOL_VERSION"
var releaseHost = "https://releases.hashicorp.com"
var httpClient = cleanhttp.DefaultClient()
// Plugins are referred to by the short name, but all URLs and files will use
// the full name prefixed with terraform-<plugin_type>-
func providerName(name string) string {
return "terraform-provider-" + name
}
// releasesURL returns the top level directory for all plugins of this type
func (p pluginURL) releasesURL() string {
// the top level directory is the plural form of the plugin type
return p.releases + p.baseName + "s"
// providerVersionsURL returns the path to the released versions directory for the provider:
// https://releases.hashicorp.com/terraform-providers/terraform-provider-name/
func providerVersionsURL(name string) string {
return releaseHost + providersPath + providerName(name) + "/"
}
// versionsURL returns the url to the directory to list available versionsURL for this plugin
func (p pluginURL) versionsURL(name string) string {
return fmt.Sprintf("%s/%s-%s", p.releasesURL(), p.baseName, name)
}
// fileURL returns the full path to a plugin based on the plugin name,
// version, GOOS and GOARCH.
func (p pluginURL) fileURL(name, version string) string {
releasesDir := fmt.Sprintf("%s-%s_%s/", p.baseName, name, version)
fileName := fmt.Sprintf("%s-%s_%s_%s_%s.zip", p.baseName, name, version, runtime.GOOS, runtime.GOARCH)
return fmt.Sprintf("%s/%s/%s", p.versionsURL(name), releasesDir, fileName)
}
var providersURL = pluginURL{
releases: releasesURL,
baseName: "terraform-provider",
}
var provisionersURL = pluginURL{
releases: releasesURL,
baseName: "terraform-provisioners",
// providerURL returns the full path to the provider file, using the current OS
// and ARCH:
// .../terraform-provider-name_<x.y.z>/terraform-provider-name_<x.y.z>_<os>_<arch>.<ext>
func providerURL(name, version string) string {
versionDir := fmt.Sprintf("%s_%s", providerName(name), version)
fileName := fmt.Sprintf("%s_%s_%s_%s.zip", providerName(name), version, runtime.GOOS, runtime.GOARCH)
u := fmt.Sprintf("%s%s/%s", providerVersionsURL(name), versionDir, fileName)
return u
}
// GetProvider fetches a provider plugin based on the version constraints, and
// copies it to the dst directory.
//
// TODO: verify checksum and signature
func GetProvider(dst, provider string, req Constraints) error {
func GetProvider(dst, provider string, req Constraints, pluginProtocolVersion uint) error {
versions, err := listProviderVersions(provider)
// TODO: return multiple errors
if err != nil {
@ -77,7 +69,7 @@ func GetProvider(dst, provider string, req Constraints) error {
return fmt.Errorf("no plugins found for provider %q", provider)
}
versions = filterProtocolVersions(provider, versions)
versions = filterProtocolVersions(provider, versions, pluginProtocolVersion)
if len(versions) == 0 {
return fmt.Errorf("no versions of %q compatible with the plugin ProtocolVersion", provider)
@ -88,7 +80,7 @@ func GetProvider(dst, provider string, req Constraints) error {
return fmt.Errorf("no version of %q available that fulfills constraints %s", provider, req)
}
url := providersURL.fileURL(provider, version.String())
url := providerURL(provider, version.String())
log.Printf("[DEBUG] getting provider %q version %q at %s", provider, version, url)
return getter.Get(dst, url)
@ -96,11 +88,11 @@ func GetProvider(dst, provider string, req Constraints) error {
// Remove available versions that don't have the correct plugin protocol version.
// TODO: stop checking older versions if the protocol version is too low
func filterProtocolVersions(provider string, versions []Version) []Version {
func filterProtocolVersions(provider string, versions []Version, pluginProtocolVersion uint) []Version {
var compatible []Version
for _, v := range versions {
log.Printf("[DEBUG] fetching provider info for %s version %s", provider, v)
url := providersURL.fileURL(provider, v.String())
url := providerURL(provider, v.String())
resp, err := httpClient.Head(url)
if err != nil {
log.Printf("[ERROR] error fetching plugin headers: %s", err)
@ -112,20 +104,19 @@ func filterProtocolVersions(provider string, versions []Version) []Version {
continue
}
proto := resp.Header.Get("X-TERRAFORM_PROTOCOL_VERSION")
proto := resp.Header.Get(protocolVersionHeader)
if proto == "" {
log.Println("[WARNING] missing X-TERRAFORM_PROTOCOL_VERSION from:", url)
log.Printf("[WARNING] missing %s from: %s", protocolVersionHeader, url)
continue
}
protoVersion, err := strconv.Atoi(proto)
if err != nil {
log.Println("[ERROR] invalid ProtocolVersion: %s", proto)
log.Printf("[ERROR] invalid ProtocolVersion: %s", proto)
continue
}
// FIXME: this shouldn't be hardcoded
if protoVersion != 4 {
if protoVersion != int(pluginProtocolVersion) {
log.Printf("[INFO] incompatible ProtocolVersion %d from %s version %s", protoVersion, provider, v)
continue
}
@ -167,22 +158,13 @@ func newestVersion(available []Version, required Constraints) (Version, error) {
// list the version available for the named plugin
func listProviderVersions(name string) ([]Version, error) {
versions, err := listPluginVersions(providersURL.versionsURL(name))
versions, err := listPluginVersions(providerVersionsURL(name))
if err != nil {
return nil, fmt.Errorf("failed to fetch versions for provider %q: %s", name, err)
}
return versions, nil
}
func listProvisionerVersions(name string) ([]Version, error) {
versions, err := listPluginVersions(provisionersURL.versionsURL(name))
if err != nil {
return nil, fmt.Errorf("failed to fetch versions for provisioner %q: %s", name, err)
}
return versions, nil
}
// return a list of the plugin versions at the given URL
func listPluginVersions(url string) ([]Version, error) {
resp, err := httpClient.Get(url)